Extensible boom



' Dec. 21 ,1926. 1,611,326

E. J. ABBE EXTENSIBI-JE BOOM v r Filed April '7, 1924 2 Sheets-Sheet 1 H JJQI INPOR Dec. 21,1926.- 7 1,611,326 E. J. ABBE EXTENSIBLE BOOM I Filed April 7, 1924 2 Sheets-Sheet 2 J marry I" 01? Patented Dec. 21, 1926.

UNITED STATES PATENT OFFICE.

ABBE, OF OLEVELAED, OHIO, ASSIGNOB TO THE ELWELLQPABKER ELEC- TRIO COMPANY, OF CLEVELAND,

OHIO, A CORPORATION OHIO.

axrnnsni'ma noon.

Application flled April 7, 1924. Serial No. 704,675.

This invention relates and more particularly to that type of tractor trucks known as an industrial crane truck,

Y wherein a crane is mounted upon the body of the truck for the loading and unloading thereof.

The general object of the invention is to provide an extensible crane or boom for this typi of truck. y invention more particularly COAtGlllplates the provision of an extending boom collapsible boom for a truck 'or be mounted upon a stationary which may be easily and cheaply taken along the or crane which may be easily and quickly extended or retracted from some point on the truck.

Other objects include the provision of a which may be extended 'fof use in. loading or unloading as from railway to a platform and which may be collapsed when it is desired to move the a, truck from place to place in more or less limited trackway.

Another object is the rovision of a compactly built telescoping m which may be either used on a truck, such as referred to, base, and manufactured from the usual conventional structural sections.

Another object is to ,rovide a rigid construction for an extensi le boom which will be equally rigid in extended as well as retracted position,

Other objects will become apparent in .the description of my invention pertaining to the accompanying drawing an the essential characteristics thereof will be summarized in the claims.

In the drawing, Fig. 1 is a side elevation of my extensible boom mounted upon a truck; Fig; 2 is a cross-section taken substantially" alongthe line 2-%-of Fig. 1; Fig. 3 is a similar cross-section taken along the line 3-3 of-Fig. 1; Fig. 4: is a fragmentary longitudinal 4 section taken substantially along the line of Fig. 5 Fig. 5 is a sectional side elevation of the operating crank line 5-5 of Fig. 3; Fig. 6 is a cross section, through a modified form of my boom.

The preferred embodiment-of my invention is shown as applied to a platform truck such as shown in-a prior patent issued to Clyde E. Cochran No. 1,481,351. Accordingly I show a ur wheel truck T in broken lines having aorwarded extension T m the to industrial trucks pivoted framel and result of this has been form a convenient counter-balance for the crane in whatever position it may be swung relative to the body of the truck.

The-boom as shown consists generally of a an extension 2 carrying at its outer end a sheave over which the hoisting cable 16 extends to support the load L in the usual manner.

The revailing practice in constructing booms or this type of truck has been to adopt a medium length of boom such that it will not interfere with the ceiling of the usual factory building, and yet. be long enough to conveniently reach the average load to be lifted by approaching the load in the running direction of the truck or by swinging the boom sideways thereof. The that the maximum reaching efiiciency of the boom has been sacrificed because of lack of head room in ;which to operate in some of the required locations.

tion to use upon a truck such as shown since the combination would be equally eflective stationarily mounted. 4 My'invention preferably comprises a pair of telescoping boom members preferably formed of the conventional structural "sections in which the base or pivoted portion of the boom consists of channel members 5 and 6, the flanges of the, channels projectin inwardly, suitable bracing members 7 an 8 being provided above and below the channels in the usual manner. The inner and sliding, portion of the boom,- I prefer to construct of similar structural shapes, channels as shown, with their respective flanges projecting outwardly. The size of channel selected for this pu'rpoie is such that when spaced apart and braced as v by the usual lattice construction shown in, Fig. 3 at 1 3, the outward edges of the flanges will slightly clear the flanges on the channels 105 5 and 6.

To eliminatesliding friction between the' two telescoping units I providerollers 20 and 21 arranged to bear against the upper and lower flanges of the channels 11 and-12 on I 7 respective channels the rollers carried by nerfchannels, v the inner boom member ing friction between the pletely guarded by reason jof being within the confines of the webs and flanges of their studs 22? andheld tightly in position 'upon (1 6 by means of nuts '23. The periphery shown as conical to conform to the slight angleulpon the inner s'ur'face /of?the flange of a standard channel, and .l reason offthe rollers being disposed at in terva lsfl along "b outer boommembenand thus "prevent slide'rs' may he "provided 25 "to: prevent sliding snugly against their respe'ctive'flanges. f

The'rollers may-be arranged in'any man ner'along the memher"1,"'butI prefer tealterntltly position the.

ersthroughout the lengthf of .the'boo'm m'em into one ber lfas shown,- by wh enabled tov use larger single pair of rollers 20 b'e tw rollers 21 or vice versain o p the boom member 2 in its extreme outward .t position.

Carried b'ythe flange members 5 and 6, I have shown brackets and'31, formingabearing for a shaft'32 upon which are suitably mounted a pair of-pinions and 36.

These. pinions are adapted to mesh with racks 37 and 38 mounted in any manner upon the-channel members 11 and 12, I prefer to employ a crank 40 rigidly mounted on one end of the pinion shaft for driving the racks holding one b.0om member locked extended position by unted upon the end of and which may be allowed to drop ormore recesses 43 on the member esired. The plunger 41 5 whenever it is d I has a l-enlarged portion 44 which slidably the crank engages the walls of a recess 45. The plung-v er is normally urged outwardly by acoil spring 46. A handle 47 is mounted upon the other end of the plunger member 41 and carries 9, lug 48 upon one side thereof, which, when gripped by the operator upon turning 5 and 6. I have-shown the channel members 5 othflanges of each offthe inthe rollers; serve to centralize with "respect to the channels. The r011, with peripheral flanges friction "hetweenj'the; channels'fshould the paftsifb'econie worn or if- "Jf, from other causes the rollers do iiotfllij fairly",

pp r and- 1 l i 11:

ich arrangement Iain rollers): Near the a free, end of the member it. is pr'efera'bleto place a een two pairs of. rderjto support,

the boom, I prefer to make pro the" crank, rides} alongv a cam,simmer,50cm. -51 upon. the crank arm'until-it engages an abutment ,52, thereby withdrawing thefplung; er'41 a suflicient distance vto 'clearjithe j booIn member'5. c l- 00 If desired Tmay'provide V, for the gears that ,will extendthe operators position on -t-l able bevel, gearing (not s it attache'dat onwendiotthe sha; '38; an "lcom' 'flfi muni catelwith the hoisting mechani'smbo'dy (i through a splined telescoping shaft which. mightbe either power or manually driven. Since "the tendency game extending portion of the boom is alwaysltodrop backward into the :pivoted portion, ratchet'pawls (not shownymay be arrangedto engageth'e teeth on the-gear 36: to hold the boom'in Edesired extended'piosition.f

In the modified" form of boomshowmin Fig. 6,1 haveshown the' extensible memler 2fpinned to the pivoted member ,iz'byi a' bar '26. In this construction th y-1acing-113 (shown in Fig.3) may be replaced by flang tubes' 27 'which'would be placed azt-"sh'orti tervals along the boom "memberf2, "'fTh' tubes would serve to guide th'ejbafr 26 I v f cilitate its insertion into the1 -}jl' 1'ole'-'f28.;.' ,jThe bar maybeheld in place' in any manner as y a' p P Ii L c a v a 4 1 1'. Inan extensible boom, a hollowjrame member, a boom member,extendingiwithin; the frame and having outwardly extending flanges disposed along its side ed esfinpairs an and rollers carried. b the frame disposed between each pair ofil nges, one of two adjacent rollers engagingone of atpairoffianges and the other engagin the other flange of the same'pairsaid adjacentrollers being separated longitudinally of the frame.

1 2. An extensible boom comprising a rigid hollow frame arrangeidfto be pivotally sup-- portedat one end, a second frame comprising members having upper and'lower outwardly extending flanges, and rollers arranged. in

ts, supported by the first named frame and earingl against' the flanges, said sets bein alternately disposed along the first-named frame, one set of rollers contacting with the .105 lower. flanges and the adjacent set contacting with the upper flanges.

- In testimony whereof, I h signature. 1 A

EDWARD J. ABBE. j 

